Just need some expert advice from you lot as I've had no luck elsewhere on Google.
This morning I was fixing my front brake pad when I noticed this particular odd shaped washer was broken so I removed it as pictured -

Here's what it looks like on the rear brake -


From what I can tell via touching it on the rear brake there's no tension at all but rather just 'sits there'. Does anyone know what this washer is for, can I live without it and/if replacement part is available?
Big thanks in advance,
Reagan
